end face rolling device

Abstract

This utility model relates to an end-face rolling device, comprising: a separate hydraulic cylinder, a thrust rod, an end-face rolling tool holder, and a lower pressure plate; the lower pressure plate is fixedly connected to the machine tool bed by bolts; the separate hydraulic cylinder is mounted on the lower pressure plate, and its hydraulic oil inlet is used to connect to an external hydraulic source; the piston output end of the separate hydraulic cylinder is coaxially connected to the thrust rod; the end of the thrust rod is rigidly connected to the end-face rolling tool holder and slidably installed in the guide hole of a stabilizer; the stabilizer is fixed to the machine tool bed; the end of the end-face rolling tool holder is provided with a rolling tool for contacting the end face of the drill collar to apply rolling pressure. This utility model, through the transmission structure of the separate hydraulic cylinder and the thrust rod, combined with the guiding design of the stabilizer, achieves ultra-high pressure precision rolling of the drill collar end face, making the end face variation stable at 0.026-0.051mm; the circularly arranged rolling rollers apply force evenly, eliminating machining vibration and significantly improving the consistency of the finished product.

Description

Technical Field

[0001] This utility model relates to the field of end face rolling technology, and in particular to an end face rolling device. Background Technology

[0002] Oil drill collars play a crucial role in oil extraction, and the quality of their end-face machining directly affects their performance and service life. In existing technologies, end-face rolling of oil drill collars primarily utilizes rolling tools to improve surface finish and hardness. However, with increasing market competition, higher demands are being placed on the precision and quality of end-face rolling for oil drill collars, particularly requiring the end-face variation to be controlled within the range of 0.026-0.051 mm.

[0003] Currently, existing processing methods have significant shortcomings in the end face rolling process. Although the traditional rolling process can process the end face to a certain extent, the limited pressure and rolling friction result in insufficient plastic deformation of the end face metal material, which cannot meet the strict requirements for the amount of change in the end face.

[0004] Therefore, there is an urgent need for an end-face rolling device that can effectively improve the accuracy and quality of end-face rolling, so as to enhance the processing level of oil drill collars and similar products. Utility Model Content

[0005] In order to overcome the shortcomings of existing technologies in the end face rolling of oil drill collars, which cannot meet the requirements for high-precision end face variation, this utility model provides a high-precision end face rolling device that can improve the end face variation to the range of 0.026-0.051mm.

[0006] The technical solution is as follows: an end-face rolling device, comprising: a separate hydraulic cylinder, a thrust rod, an end-face rolling tool bar, and a lower pressure plate; the lower pressure plate is fixedly connected to the machine tool bed by bolts; the separate hydraulic cylinder is mounted on the lower pressure plate, and its hydraulic oil input port is used to connect to an external hydraulic source; the piston output end of the separate hydraulic cylinder is coaxially connected to the thrust rod; the end of the thrust rod is rigidly connected to the end-face rolling tool bar as a whole, and is slidably installed in the guide hole of a stabilizer, the stabilizer being fixed to the machine tool bed; the end of the end-face rolling tool bar is provided with a rolling tool for contacting the end face of the drill collar to apply rolling pressure.

[0007] As a further preferred embodiment, the thrust rod has a stepped shaft structure, with its large-diameter section close to the piston rod end of the split hydraulic cylinder, and its small-diameter section connected to the end face rolling cutter rod.

[0008] As a further preferred embodiment, the rolling cutter includes a plurality of rotatable rolling rollers, which are arranged in a ring along the axis of the end face rolling cutter bar, and the axis of each rolling roller is perpendicular to the axis of the end face rolling cutter bar.

[0009] As a further preferred embodiment, the rolling roller has a cylindrical structure and is rotatably embedded in the end of the rolling cutter body away from the end face of the rolling cutter bar.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] This invention achieves ultra-high pressure precision rolling of the drill collar end face through a transmission structure of a separate hydraulic cylinder and a thrust rod, combined with the guiding design of the stabilizer, so that the end face variation is stable at 0.026-0.051mm; the rolling rollers arranged in a ring apply force evenly, eliminating processing vibration and greatly improving the consistency of finished products. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0013] Figure 2 This is a longitudinal sectional view of the centralizer of this utility model.

[0014] Figure 3 This utility model Figure 2 A magnified view of A in the middle.

[0015] The meanings of the labels in the attached diagram are as follows: 1. Separate hydraulic cylinder, 2. Thrust rod, 3. End face rolling cutter bar, 4. Lower pressure plate, 5. Rolling cutter, 51. Rolling roller, 6. Centralizer, 7. Machine tool, 8. Hydraulic source. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1-3The end-face rolling device shown is mainly used for end-face rolling of oil drill collars. The end-face rolling device provided in this embodiment allows the rolling tool to apply greater pressure and rolling friction to the end face of the drill collar, causing greater plastic deformation of the end-face metal material, thereby achieving the requirement of end-face change of 0.026-0.051mm. This device is rigidly connected to the machine tool 7 bed through high-strength bolts of the lower pressure plate 4, providing a stable base for the separate hydraulic cylinder 1. The piston output end of the separate hydraulic cylinder 1 is coaxial with the stepped thrust rod 2. The separate hydraulic cylinder 1 is connected to the hydraulic source 8. The stepped thrust rod 2 and the end-face rolling tool bar 3 are connected as one unit and slidably installed in the guide hole on the stabilizer 6, wherein the stabilizer 6 is fixed to the machine tool 7 bed.

[0018] refer to Figure 2 The thrust rod 2 is a stepped shaft structure. The small diameter section of the stepped thrust rod 2 is threaded and locked to the end face rolling tool rod 3. Its large diameter section is close to the piston rod end of the split hydraulic cylinder (1). This transmission structure enables the pressure of the split hydraulic cylinder 1 to be transmitted to the end of the end face rolling tool rod 3 without loss. When the hydraulic source 8 drives the cylinder piston to extend, the thrust rod 2 pushes the end face rolling tool rod 3 to slide precisely along the guide hole of the stabilizer 6, completely eliminating radial wobble and ensuring that the 20MPa level ultra-high pressure is accurately applied to the end face of the workpiece.

[0019] Figure 3 The image shown is an enlarged view of the front end of the roller burnishing cutter 5. Multiple cylindrical rollers 51 are evenly distributed in a ring at the front end of the cutter 5. The axis of each roller 51 is perpendicular to the axis of the end face roller burnishing shank 3. The rollers 51 are embedded in the front end face of the cutter 5, with the exposed portion not exceeding one-third of the total length. The ring-shaped layout and rotational design of the rollers 51 generate uniform rolling friction when in contact with the rotating workpiece, causing deep plastic deformation of the end face metal without generating localized stress cracks.

[0020] Usage process: After installation, adjust the gap between the rolling cutter 5 and the rotating workpiece to 8mm, start the hydraulic source 8 to push the piston of the split hydraulic cylinder 1, and stop pressurizing when the pressure gauge value reaches 20MPa; maintain the pressure for 3 minutes, during which the roller 51 continuously rolls and applies pressure on the end face, and the metal deformation reaches 0.035mm; after depressurization, retract the pressure bar 3 to complete the precision rolling process.

[0021] When the equipment is started, machine tool 7 drives the end-face rolling product a to begin rotating. The rolling cutter 5 slowly approaches the end face of the workpiece, maintaining a 5-10mm gap between the two at the part of the product that needs to be rolled. Check that the bolts of the lower pressure plate 4 are reliably connected to the machine tool 7 bed and are not loose. Turn on the hydraulic source 8, and the separate hydraulic cylinder 1 on the lower pressure plate 4 begins to work. When the piston of the separate hydraulic cylinder 1 slowly extends and interacts with the thrust rod 2, the end-face rolling cutter 3 will also be subjected to force and friction with the end-face rolling product. When the pressure value of the hydraulic source 8 reaches 20MPa, stop pressurizing. Maintain 20MPa for three minutes. At a pressure value of 20MPa, the end-face change is 0.01mm after one minute of hydraulic pressure maintenance. Under the large compressive stress, the end-face rolling part of the end-face rolling product a undergoes greater plastic deformation, thereby achieving the requirement of a product end-face change of 0.026-0.051mm. After the rolling time is reached, first release the hydraulic power source 8 to depressurize it. Once the pressure gauge reaches a safe value, shut down the machine tool 7. The rolling process is complete.

[0022] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the inventive concept, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An end face roll-pressing device characterized by comprising: include: Separable hydraulic cylinder (1), thrust rod (2), end face rolling cutter bar (3) and lower pressure plate (4); The lower pressure plate (4) is fixedly connected to the bed of the machine tool (7) by bolts; The split hydraulic cylinder (1) is mounted on the lower pressure plate (4), and its hydraulic oil input port is used to connect to an external hydraulic source (8); The piston output end of the split hydraulic cylinder (1) is coaxially connected to the thrust rod (2); The end of the thrust rod (2) is rigidly connected to the end face rolling tool rod (3) and is slidably installed in the guide hole of the stabilizer (6). The stabilizer (6) is fixed to the bed of the machine tool (7). The end of the end face rolling cutter bar (3) is provided with a rolling cutter (5) for contacting the end face of the drill collar to apply rolling pressure.

2. The end face rolling device according to claim 1, characterized in that: The thrust rod (2) is a stepped shaft structure, with its large diameter section close to the piston rod end of the split hydraulic cylinder (1), and its small diameter section connected to the end face rolling cutter rod (3).

3. The end face rolling device according to claim 1, characterized in that: The rolling cutter (5) includes a plurality of rotatable rolling rollers (51), which are arranged in a ring along the axis of the end face rolling cutter bar (3), and the axis of each rolling roller (51) is perpendicular to the axis of the end face rolling cutter bar (3).

4. The end face rolling device according to claim 3, characterized in that: The rolling roller (51) is a columnar structure and is rotatably embedded in the end of the rolling cutter (5) away from the end face rolling cutter bar (3).

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